Amazon and iTunes just released a second edition of the new 21 Guns single with the musical cast. This one features Matt Caplan singing the main vocals instead of Billie Joe. And doing a very good job at it, might I add.

Here's a preview
[player=21guns]21guns2nd[/player]

If you're interested in picking up the second version, you can get it on Amazon or iTunes for $1.29.